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5. INCOME TAXES - Statutory income tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
INCOME TAXES
U.S. Federal taxes at statutory rate	$ (17)	$ (956)	$ (1,922)
State taxes, net of federal benefit	3	(204)	(39)
Stock-based compensation	630	470	447
Tax credits	(398)	(539)	(472)
Foreign tax rate differential	(1,525)	(368)	(916)
Tax exempt interest	(5)	(9)	(20)
Non-deductible expenses and other	24	6	(35)
Income tax expense (benefit) before change in valuation allowance	(1,288)	(1,600)	(2,957)
Valuation allowance	1,354	959	2,282
Provision (benefit) for income taxes	$ 66	$ (641)	$ (675)

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to non deductible expenses and other adjustments

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